Untitled

#include <cs50.h>
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

string calculateGradeLevel(int letters, int words, int sentences);
int numOfLetters(string text, int length);
int numOfWords(string text, int length);
int numOfSentences(string text, int length);
float averagePer100Words(char averageOf, int letters, int words, int sentences);

// command line arguments appropriate here
int main(int argc, string argv[])
{
    string text = get_string("\nText: ");
    int length = strlen(text);
    int letters = numOfLetters(text, length);
    int words = numOfWords(text, length);
    int sentences = numOfSentences(text, length);

    string gradeLevel = calculateGradeLevel(letters, words, sentences);
    printf("%s\n", gradeLevel);
}

string calculateGradeLevel(int letters, int words, int sentences)
{ // *approximate* grade level
  // formula: index = 0.0588 * L - 0.296 * S - 15.8
  // L = avg num of letters per 100 words
  // S = avg num of sentences per 100 words
    float L = averagePer100Words('L', letters, words, sentences);
    float S = averagePer100Words('S', letters, words, sentences);
    float index = 0.0588 * L - 0.296 * S - 15.8;

    string gradeLevel;
    int roundedIndex = roundf(index);

    if (roundedIndex >= 16)
    {
        gradeLevel = "Grade 16+";
    }
    else if (roundedIndex < 1)
    {
        gradeLevel = "Before Grade 1";
    }
    else
    {
        char *buffer = malloc(50 * sizeof(char));
        sprintf(buffer, "Grade %i", roundedIndex);
        gradeLevel = buffer; // when the buffer gets out of this method's scope into main, the
                             // output is "i". check why. // FIXED. allocated memory.
    }

    return gradeLevel;
}

int numOfLetters(string text, int length)
{
    int letters = 0;
    for (int i = 0; i < length; i++)
    {
        if (isalpha(text[i]) != 0 && text[i] != '-' && text[i] != 96 &&
            text[i] != 39) // is a letter
        {
            letters++;
        }
    }

    return letters;
}

int numOfWords(string text, int length)
{
    int words = 1; // numOfSpaces + 1 = numOfWords
    for (int i = 0; i < length; i++)
    {
        if (isspace(text[i]))
        {
            words++;
        }
        if (text[i] == '-')
        {
            words--;
        }
    }

    return words;
}

int numOfSentences(string text, int length)
{
    int sentences = 0;
    for (int i = 0; i < length; i++)
    {
        if (ispunct(text[i]) != 0 && text[i] != ',' && text[i] != '"' && text[i] != '-' &&
            text[i] != 96)
        {
            sentences++;
        }
    }

    return sentences;
}

float averagePer100Words(char averageOf, int letters, int words, int sentences)
{ // calculate letter average or sentence average (per 100 words)
    float average;
    if (strchr(&averageOf, 'L'))
    {
        average = (100.0 * (float) letters) / (float) words;

        return average;
    }
    else if (strchr(&averageOf, 'S'))
    {
        average = (100.0 * (float) sentences) / (float) words;

        return average;
    }

    return 0;
}